An apparatus and method for evaluating the flexibility characteristics of a swing plate flat bridge

Abstract

The application provides an evaluation device and method for flat bridge flexibility characteristics of a swing plate, which comprises a fixing assembly, a thrust loading unit, a negative pressure generator and a data processing unit; the thrust loading unit comprises an open-sided shell, a communication pipe, a thrust device, a sliding block, a pressure sensor, a distance sensor and a force transmission rod; the thrust device is used to push the sliding block to slide from a first preset position to a starting position and then from the starting position to a second preset position; the pressure sensor is used to collect pressure values; the distance sensor is used to measure the displacement of the sliding block; the second end of the force transmission rod extends out of the communication pipe and is in contact with the center swing of the swing plate; the negative pressure generator is used to provide a negative pressure environment inside the shell and the communication pipe during the sliding of the sliding block from the first preset position to the starting position; and the data processing unit is used to evaluate the flat bridge flexibility characteristics of the swing plate. The application can solve the technical problem of poor evaluation quality of the flat bridge flexibility characteristics of the swing plate in the prior art.

Description

Technical Field

[0001] This invention relates to the field of accelerometer component technology, and in particular to an evaluation device and method for the flexibility characteristics of a pendulum bridge. Background Technology

[0002] The pendulum is the core component of a quartz flexible accelerometer used to sense external acceleration, and its flat-bridge flexibility directly affects the accelerometer's performance. Therefore, the flexibility characteristics of the pendulum need to be evaluated during the accelerometer's manufacturing process.

[0003] Currently, this operation is entirely manual, requiring the measurement of the offset of the quartz pendulum's center under gravity. This method can only assess the flat bridge characteristics through the final sag distance, and cannot accurately evaluate the performance of the flexible flat bridge before the center pendulum reaches its equilibrium position. Therefore, there is an urgent need to optimize the existing measurement method to improve the evaluation quality of the pendulum flat bridge's flexibility characteristics. Summary of the Invention

[0004] This invention provides an apparatus and method for evaluating the flexibility characteristics of a pendulum flat bridge, which can solve the technical problem of poor evaluation quality of the flexibility characteristics of pendulum flat bridges in the prior art.

[0005] According to one aspect of the present invention, an evaluation device for the flexibility characteristics of a pendulum flat bridge is provided, the device comprising a fixing component, a thrust loading unit, a negative pressure generator, and a data processing unit;

[0006] The fixing component includes a base and a first fixing seat and a second fixing seat respectively disposed on the base. The first fixing seat is used to fix the swing plate, and the second fixing seat is used to fix the thrust loading unit.

[0007] The thrust loading unit includes a housing with one open side, a connecting pipe, a thruster, a slider, a pressure sensor, a distance sensor, and a force transmission rod. The thruster, slider, pressure sensor, and distance sensor are all housed within the housing, and the force transmission rod is housed within the connecting pipe. The open end of the housing is connected to the first end of the connecting pipe, and the housing and the connecting pipe are in communication. The push rod of the thruster is connected to the first end of the slider. The thruster is used to push the slider, causing it to slide from a first preset position to a starting position, and then from the starting position to a second preset position. When the slider is in the first preset position, the central pendulum of the pendulum and the outer ring are on different planes and offset towards the force transmission rod. When the slider is in the starting position... The central pendulum and outer ring of the pendulum are on the same plane. When the slider is in the second preset position, the central pendulum and outer ring are on different planes and offset away from the force transmission rod. At the same time, the pressure value collected by the pressure sensor reaches the preset value. The first end of the pressure sensor is connected to the second end of the slider, and the second end is in contact with the first end of the force transmission rod. The pressure sensor moves toward the pendulum under the action of the slider to collect the pressure value. The measuring end of the distance sensor faces the slider and is used to measure the displacement of the slider from the starting position to the second preset position. The second end of the force transmission rod extends out of the connecting tube and is in contact with the central pendulum of the pendulum. The force transmission rod moves toward the pendulum under the action of the pressure sensor.

[0008] The negative pressure generator is connected to the housing and is used to provide a negative pressure environment for the housing and the inside of the connecting pipe during the process of the slider sliding from the first preset position to the starting position;

[0009] The data processing unit is used to obtain a first offset of the center pendulum of the pendulum piece based on a first displacement of the slider, obtain a second offset of the center pendulum piece based on a second displacement of the slider, and evaluate the flat bridge flexibility characteristics of the pendulum piece based on the first offset and the second offset.

[0010] Wherein, the first displacement is the displacement measured by the distance sensor when the pendulum is placed upright in the first fixed base, and the second displacement is the displacement measured by the distance sensor when the pendulum is placed in reverse in the first fixed base.

[0011] Preferably, the thrust loading unit further includes a linear bearing sleeve, which is disposed between the connecting pipe and the force transmission rod so that the force transmission rod is parallel to the central axis of the connecting pipe.

[0012] Preferably, the cross-sectional area of ​​the open end of the shell is larger than the cross-sectional area of ​​the first end of the connecting pipe.

[0013] Preferably, the second end of the connecting pipe is a variable diameter constriction structure.

[0014] Preferably, the circumferential gap between the slider and the housing is less than a preset value, and the negative pressure generator is used to provide a negative pressure environment for the space between the open end of the housing and the slider and the inside of the connecting pipe during the process of the slider sliding from the first preset position to the starting position.

[0015] Preferably, the first fixing base is U-shaped, including a base plate and a first cantilever and a second cantilever spaced apart on the base plate. The first cantilever and the second cantilever are parallel to each other. The distance between the first cantilever and the second cantilever is greater than the central pendulum diameter of the pendulum and less than the outer diameter of the outer ring of the pendulum. The first fixing base is provided with a blind groove that connects the first cantilever, the base plate and the second cantilever. The pendulum is disposed in the blind groove.

[0016] Preferably, the first fixing seat further includes a fixing plunger, the first cantilever and the second cantilever are respectively provided with through holes, and the outer ring of the swing plate is respectively provided with bosses at positions corresponding to the through holes. Each boss is provided with a connecting hole, and the fixing plunger passes through the through holes and the connecting holes to fix the swing plate.

[0017] Preferably, the central axes of the housing and the connecting pipe are parallel; the central axis of the slider is parallel to the central axis of the housing, and the slider slides along its own central axis; the sensitive axis of the pressure sensor is parallel to the central axis of the housing; and the central axis of the push rod of the thruster is parallel to the central axis of the housing.

[0018] Preferably, the thruster includes a motor and a push rod connected to the motor, the motor being fixedly connected to the housing, and the push rod being connected to the first end of the slider.

[0019] According to another aspect of the present invention, a method for evaluating the flexibility characteristics of a pendulum flat bridge is provided, the method employing any of the aforementioned apparatus for evaluation, specifically comprising:

[0020] S10. Install the pendulum to be measured on the first fixed base. At this time, the central pendulum of the pendulum swings freely.

[0021] S20. Turn on the negative pressure generator. The center of the pendulum stops swinging freely under the negative pressure suction inside the connecting tube and shifts towards the direction of the force transmission rod.

[0022] S30. Use the push rod of the thruster to push the slider toward the swing plate until the second end of the force transmission rod contacts the center of the swing plate, and take the current position of the slider as the first preset position.

[0023] S40. Continue to use the push rod of the thruster to push the slider toward the pendulum until the center of the pendulum and the outer ring are on the same plane. Take the current position of the slider as the starting position.

[0024] S50. Turn off the negative pressure generator and continue to use the push rod of the thruster to push the slider toward the swing plate, so that the center of the swing plate deviates from the plane of the outer ring of the swing plate until the pressure value collected by the pressure sensor reaches the preset value. Take the current position of the slider as the second preset position.

[0025] S60. Obtain the first displacement of the slider measured by the distance sensor from the starting position to the second preset position;

[0026] S70. Remove the pendulum from the first fixed seat, rotate it 180° along the pendulum axis, and then reinstall it on the first fixed seat. At this time, the central pendulum of the pendulum swings freely.

[0027] S80, repeat S20-S50, and obtain the second displacement of the slider measured by the distance sensor from the starting position to the second preset position;

[0028] S90. The data processing unit obtains the first offset of the center pendulum of the pendulum based on the first displacement of the slider, obtains the second offset of the center pendulum of the pendulum based on the second displacement of the slider, and evaluates the flat bridge flexibility characteristics of the pendulum based on the first offset and the second offset.

[0029] By applying the technical solution of this invention, a negative pressure sensor is used to eliminate the free sway of the central pendulum of the pendulum, a thruster is used to push the central pendulum of the pendulum, a distance sensor is used to measure the first and second displacements of the slider, and a data processing unit is used to obtain the first and second offsets of the central pendulum of the pendulum, thereby evaluating the flat bridge flexibility characteristics of the pendulum. Compared with the prior art, the evaluation method of this invention has a simple process, high measurement accuracy, and can significantly improve evaluation quality, increase operational efficiency, improve measurement consistency, and reduce labor costs. Attached Figure Description

[0030] The accompanying drawings, which form part of this specification, are provided to further illustrate embodiments of the invention and, together with the textual description, explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0031] Figure 1 A schematic diagram of the structure of an evaluation device for the flexibility characteristics of a pendulum flat bridge according to an embodiment of the present invention is shown;

[0032] Figure 2 It shows Figure 1 Side view of the evaluation device for the flexibility characteristics of the mid-swing flat bridge;

[0033] Figure 3 It shows Figure 1 A front view of the evaluation device for the flexibility characteristics of the mid-swing flat bridge;

[0034] Figure 4 It shows Figure 1 An enlarged schematic diagram of the thrust loading unit of the evaluation device for the flexibility characteristics of the mid-swing flat bridge.

[0035] The above figures include the following reference numerals:

[0036] 10. Fixing component; 11. Base; 12. First fixing seat;

[0037] 121. Base plate; 122. First cantilever; 123. Second cantilever;

[0038] 124. Fixed plunger; 13. Second fixed seat;

[0039] 20. Thrust loading unit; 21. Shell; 22. Connecting pipe;

[0040] 23. Thruster; 231. Motor; 232. Push rod;

[0041] 24. Slider; 25. Pressure sensor; 26. Distance sensor;

[0042] 27. Force transmission rod; 28. Linear bearing sleeve;

[0043] 30. Negative pressure generator; 40. Data processing unit; 50. Rotary plate;

[0044] 51. Central pendulum; 52. Outer ring; 53. Flat bridge. Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0048] like Figures 1-4 As shown, the present invention provides an evaluation device for the flexibility characteristics of a pendulum flat bridge, the device comprising a fixing component 10, a thrust loading unit 20, a negative pressure generator 30, and a data processing unit 40;

[0049] The fixing component 10 includes a base 11 and a first fixing seat 12 and a second fixing seat 13 respectively disposed on the base 11. The first fixing seat 12 is used to fix the swing plate 50, and the second fixing seat 13 is used to fix the thrust loading unit 20.

[0050] The thrust loading unit 20 includes a housing 21 with one open side, a connecting pipe 22, a thruster 23, a slider 24, a pressure sensor 25, a distance sensor 26, and a force transmission rod 27. The thruster 23, the slider 24, the pressure sensor 25, and the distance sensor 26 are all disposed within the housing 21, and the force transmission rod 27 is disposed within the connecting pipe 22. The open end of the housing 21 is connected to the first end of the connecting pipe 22, and the housing 21 and the connecting pipe 22 are in communication. The push rod 232 of the thruster 23 is connected to the first end of the slider 24. The thruster 23 is used to push the slider 24, causing it to slide from a first preset position to a starting position, and then from the starting position to a second preset position. When the slider 24 is in the first preset position, the central pendulum 51 of the pendulum and the outer ring 52 are on different planes and offset towards the force transmission rod 27. 4. When in the initial position, the center pendulum 51 and the outer ring 52 of the pendulum are on the same plane. When the slider 24 is in the second preset position, the center pendulum 51 and the outer ring 52 of the pendulum are on different planes and are offset away from the force transmission rod 27. At the same time, the pressure value collected by the pressure sensor 25 reaches the preset value. The first end of the pressure sensor 25 is connected to the second end of the slider 24, and the second end is in contact with the first end of the force transmission rod 27. The pressure sensor 25 moves toward the pendulum 50 under the action of the slider 24 to collect the pressure value. The measuring end of the distance sensor 26 faces the slider 24 and is used to measure the displacement of the slider 24 from the initial position to the second preset position. The second end of the force transmission rod 27 extends out of the connecting pipe 22 and is in contact with the center pendulum 51 of the pendulum. The force transmission rod 27 moves toward the pendulum 50 under the action of the pressure sensor 25.

[0051] The negative pressure generator 30 is connected to the housing 21 and is used to provide a negative pressure environment for the housing 21 and the inside of the connecting pipe 22 during the process of the slider 24 sliding from the first preset position to the starting position.

[0052] The data processing unit 40 is used to obtain the first offset of the center pendulum 51 of the pendulum piece according to the first displacement of the slider 24, obtain the second offset of the center pendulum 51 of the pendulum piece according to the second displacement of the slider 24, and evaluate the flat bridge flexibility characteristics of the pendulum piece according to the first offset and the second offset.

[0053] Wherein, the first displacement is the displacement measured by the distance sensor 26 when the pendulum 50 is placed in the first fixed base 12 in the forward direction, and the second displacement is the displacement measured by the distance sensor 26 when the pendulum 50 is placed in the first fixed base 12 in the reverse direction.

[0054] In this invention, forward placement means that the pendulum 50 is placed in the current direction, and reverse placement means that the pendulum 50 is rotated 180° along the pendulum axis based on the current direction before being placed.

[0055] This invention utilizes a negative pressure sensor to eliminate the free sway of the central pendulum 51 of the pendulum, a thruster 23 to push the central pendulum 51, a distance sensor 26 to measure the first and second displacements of the slider 24, and a data processing unit 40 to acquire the first and second offsets of the central pendulum 51, thereby evaluating the flat bridge flexibility characteristics of the pendulum. Compared with existing technologies, the evaluation method of this invention has a simple process, high measurement accuracy, and can significantly improve evaluation quality, increase operational efficiency, improve measurement consistency, and reduce labor costs.

[0056] According to one embodiment of the present invention, such as Figure 2 As shown, in order to allow the central pendulum 51 of the pendulum to have swing space, the first fixing seat 12 is U-shaped, including a base plate 121 and a first cantilever 122 and a second cantilever 123 spaced apart on the base plate 121. The first cantilever 122 and the second cantilever 123 are parallel to each other. The distance between the first cantilever 122 and the second cantilever 123 is greater than the diameter of the central pendulum 51 of the pendulum and smaller than the outer diameter of the outer ring 52 of the pendulum. The first fixing seat 12 is provided with a blind groove that connects the first cantilever 122, the base plate 121 and the second cantilever 123. The pendulum 50 is disposed in the blind groove.

[0057] Specifically, the width of the first fixed seat 12 is 1 mm to 4 mm larger than the outer diameter of the outer ring 52 of the swing plate, and the width of the blind groove is 0.1 mm to 0.5 mm larger than the thickness of the outer ring 52 of the swing plate.

[0058] According to one embodiment of the present invention, such as Figure 2 As shown, in order to better fix the swing plate 50, the first fixing seat 12 also includes a fixing plunger 124. The first cantilever 122 and the second cantilever 123 are respectively provided with through holes. The outer ring 52 of the swing plate is respectively provided with a boss at the position corresponding to the through hole. Each boss is provided with a connecting hole. The fixing plunger 124 passes through the through hole and the connecting hole to fix the swing plate 50.

[0059] Specifically, the first cantilever 122 and the second cantilever 123 are parallel to each other and both perpendicular to the base plate 121, so as to facilitate the installation of the swing plate 50.

[0060] The elastic end of the fixed plunger 124 is 0.2 mm to 0.8 mm away from the other end of the blind groove.

[0061] According to one embodiment of the present invention, such as Figure 3 As shown, the first fixed seat 12 is bolted to the base 11, and the second fixed seat 13 is bolted to the base 11. The thrust loading unit 20 is also bolted to the second fixed seat 13.

[0062] According to one embodiment of the present invention, such as Figure 4 As shown, the thrust loading unit 20 also includes a linear bearing sleeve 28, which is disposed between the connecting pipe 22 and the force transmission rod 27 so that the force transmission rod 27 is parallel to the central axis of the connecting pipe.

[0063] According to one embodiment of the present invention, in order to increase the negative pressure effect on the central pendulum 51 of the pendulum plate, the cross-sectional area of ​​the open end of the housing 21 is larger than the cross-sectional area of ​​the first end of the connecting pipe 22, and at the same time, the second end of the connecting pipe 22 is a variable diameter constriction structure.

[0064] Specifically, the inner diameter of the constricted end of the second end of the connecting pipe 22 is 0.5 mm to 2 mm larger than the outer diameter of the force transmission rod 27;

[0065] According to one embodiment of the present invention, the circumferential gap between the slider 24 and the housing 21 is less than a preset value, and the negative pressure generator 30 is used to provide a negative pressure environment for the space between the open end of the housing 21 and the slider 24 and the interior of the connecting pipe 22 during the process of the slider 24 sliding from the first preset position to the starting position.

[0066] With the above settings, it is only necessary to provide a negative pressure environment to the space to the left of the slider 24 to further increase the negative pressure effect on the center pendulum 51 of the pendulum plate.

[0067] Specifically, a through hole is provided on the outer wall between the open side of the housing 21 and the slider 24. The negative pressure generator 30 is connected to the through hole through a negative pressure pipeline to provide a negative pressure environment for the left side space of the housing 21 and the inside of the connecting pipe 22.

[0068] The vacuum pressure of the negative pressure generator 30 is not higher than -50 kPa.

[0069] According to one embodiment of the present invention, in order to improve the accuracy of the pressure sensor 25, the central axes of the housing 21 and the connecting pipe 22 are parallel; the central axis of the slider 24 is parallel to the central axis of the housing 21, and the slider 24 slides along its own central axis; the sensitive axis of the pressure sensor 25 is parallel to the central axis of the housing 21; and the central axis of the push rod 232 of the thruster 23 is parallel to the central axis of the housing 21. The pressure sensor 25 has a minimum range better than 0.01 gf and an accuracy better than 0.001 gf.

[0070] According to one embodiment of the present invention, the thruster 23 includes a motor 231 and a push rod 232 connected to the motor 231. The motor 231 is fixedly connected to the housing 21, and the push rod 232 is connected to the first end of the slider 24. The motor 231 is fixedly connected to the housing 21 by screws. The effective stroke of the thruster 23 is not less than 2 mm, the thrust is greater than 0.5 gf, the speed is less than 10 mm / s, and the telescopic control accuracy is better than 50 μm.

[0071] According to one embodiment of the present invention, the distance sensor 26 is fixedly connected to the housing 21, and the range of the distance sensor 26 is no greater than 20 mm and the measurement accuracy is better than 0.01 mm.

[0072] According to one embodiment of the present invention, the distance sensor 26 is further configured to measure the first displacement and the second displacement of the slider 24 in real time, and the data processing unit 40 is further configured to obtain a plurality of first offsets and a plurality of second offsets of the center pendulum 51 of the pendulum piece based on a plurality of first displacements and a plurality of second displacements, obtain a relationship graph between the first offset and the pressure value and a relationship graph between the second offset and the pressure value based on a plurality of first offsets and a plurality of second offsets, and evaluate the flat bridge flexibility characteristics of the pendulum piece based on the relationship graph between the first offset and the pressure value and the relationship graph between the second offset and the pressure value.

[0073] The present invention also provides a method for evaluating the flexibility characteristics of a pendulum flat bridge, wherein the method uses any of the above-described devices for evaluation, specifically including:

[0074] S10. The pendulum 50 to be measured is installed on the first fixed base 12. At this time, the central pendulum 51 of the pendulum swings freely.

[0075] S20. Open the negative pressure generator 30. The center pendulum 51 of the pendulum stops swinging freely under the negative pressure suction in the connecting pipe and shifts towards the direction of the force transmission rod 27.

[0076] S30. Using the push rod 232 of the pusher 23, push the slider 24 toward the swing plate 50 until the second end of the force transmission rod 27 contacts the center swing 51 of the swing plate, and take the current position of the slider 24 as the first preset position.

[0077] S40. Continue to use the push rod 232 of the thruster 23 to push the slider 24 toward the swing plate 50 until the center swing 51 of the swing plate and the outer ring 52 are on the same plane, and take the current position of the slider 24 as the starting position.

[0078] S50, turn off the negative pressure generator 30, and continue to use the push rod 232 of the thruster 23 to push the slider 24 toward the swing plate 50, so that the center swing 51 of the swing plate deviates from the plane of the outer ring 52 of the swing plate, until the pressure value collected by the pressure sensor 25 reaches the preset value, and take the current position of the slider 24 as the second preset position; at this time, the distance between the center swing 51 of the swing plate and the plane of the outer ring 52 should be less than 2mm, so as to avoid damage to the flat bridge 53 of the swing plate, resulting in low accuracy in subsequent use;

[0079] S60. Obtain the first displacement of the slider 24 from the starting position to the second preset position, as measured by the distance sensor 26.

[0080] S70. Remove the pendulum 50 from the first fixed seat 12, rotate it 180° along the pendulum axis of the pendulum 50 and then reinstall it on the first fixed seat 12. At this time, the central pendulum 51 of the pendulum swings freely.

[0081] In order to facilitate the removal of the pendulum 50, the push rod 232 of the thruster 23 is first retracted, and then the pendulum 50 is removed from the first fixed seat 12.

[0082] S80, repeat S20-S50, and obtain the second displacement of the slider 24 from the starting position to the second preset position as measured by the distance sensor 26;

[0083] S90, the data processing unit 40 obtains the first offset of the center pendulum 51 of the pendulum piece according to the first displacement of the slider 24, obtains the second offset of the center pendulum 51 of the pendulum piece according to the second displacement of the slider 24, and evaluates the flat bridge flexibility characteristics of the pendulum piece according to the first offset and the second offset.

[0084] This invention utilizes a negative pressure sensor to eliminate the free sway of the central pendulum 51 of the pendulum, a thruster 23 to push the central pendulum 51, a distance sensor 26 to measure the first and second displacements of the slider 24, and a data processing unit 40 to acquire the first and second offsets of the central pendulum 51, thereby evaluating the flat bridge flexibility characteristics of the pendulum. Compared with existing technologies, the evaluation method of this invention has a simple process, high measurement accuracy, and can significantly improve evaluation quality, increase operational efficiency, improve measurement consistency, and reduce labor costs.

[0085] According to one embodiment of the present invention, the distance sensor 26 can also measure the first displacement and the second displacement of the slider 24 in real time. The data processing unit 40 can also obtain multiple first offsets and multiple second offsets of the center pendulum 51 of the pendulum piece based on multiple first displacements and multiple second displacements, obtain a relationship diagram between the first offset and the pressure value and a relationship diagram between the second offset and the pressure value based on multiple first offsets and multiple second offsets, and evaluate the flat bridge flexibility characteristics of the pendulum piece based on the relationship diagram between the first offset and the pressure value and the relationship diagram between the second offset and the pressure value.

[0086] The evaluation method of this invention can effectively improve product accuracy, increase product assembly yield, reduce component waste, and save production costs.

[0087] In summary, this invention provides an evaluation device and method for the flexible characteristics of a pendulum bridge. It utilizes a negative pressure sensor to eliminate the free sway of the central pendulum 51, a thruster 23 to push the central pendulum 51, a distance sensor 26 to measure the first and second displacements of the slider 24, and a data processing unit 40 to acquire the first and second offsets of the central pendulum 51, thereby evaluating the flexible characteristics of the pendulum bridge. Compared with existing technologies, the evaluation method of this invention has a simple process, high measurement accuracy, significantly improved evaluation quality, increased operational efficiency, improved measurement consistency, and reduced labor costs.

[0088] The parts of this invention not described in detail are techniques known to those skilled in the art.

[0089] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0090] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0091] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for evaluating the flexibility characteristics of a pendulum flat bridge, characterized in that, The device includes a fixing component, a thrust loading unit, a negative pressure generator, and a data processing unit; The fixing component includes a base and a first fixing seat and a second fixing seat respectively disposed on the base. The first fixing seat is used to fix the swing plate, and the second fixing seat is used to fix the thrust loading unit. The thrust loading unit includes a housing with one open side, a connecting pipe, a thruster, a slider, a pressure sensor, a distance sensor, and a force transmission rod. The thruster, slider, pressure sensor, and distance sensor are all housed within the housing, and the force transmission rod is housed within the connecting pipe. The open end of the housing is connected to the first end of the connecting pipe, and the housing and the connecting pipe are in communication. The push rod of the thruster is connected to the first end of the slider. The thruster is used to push the slider, causing it to slide from a first preset position to a starting position, and then from the starting position to a second preset position. When the slider is in the first preset position, the central pendulum of the pendulum and the outer ring are on different planes and offset towards the force transmission rod. When the slider is in the starting position... The central pendulum and outer ring of the pendulum are on the same plane. When the slider is in the second preset position, the central pendulum and outer ring are on different planes and offset away from the force transmission rod. At the same time, the pressure value collected by the pressure sensor reaches the preset value. The first end of the pressure sensor is connected to the second end of the slider, and the second end is in contact with the first end of the force transmission rod. The pressure sensor moves toward the pendulum under the action of the slider to collect the pressure value. The measuring end of the distance sensor faces the slider and is used to measure the displacement of the slider from the starting position to the second preset position. The second end of the force transmission rod extends out of the connecting tube and is in contact with the central pendulum of the pendulum. The force transmission rod moves toward the pendulum under the action of the pressure sensor. The negative pressure generator is connected to the housing and is used to provide a negative pressure environment for the housing and the inside of the connecting pipe during the process of the slider sliding from the first preset position to the starting position; The data processing unit is used to obtain a first offset of the center pendulum of the pendulum piece based on a first displacement of the slider, obtain a second offset of the center pendulum piece based on a second displacement of the slider, and evaluate the flat bridge flexibility characteristics of the pendulum piece based on the first offset and the second offset. Wherein, the first displacement is the displacement measured by the distance sensor when the pendulum is placed upright in the first fixed base, and the second displacement is the displacement measured by the distance sensor when the pendulum is placed in reverse in the first fixed base.

2. The apparatus according to claim 1, characterized in that, The thrust loading unit also includes a linear bearing sleeve, which is disposed between the connecting pipe and the force transmission rod so that the force transmission rod is parallel to the central axis of the connecting pipe.

3. The apparatus according to claim 1 or 2, characterized in that, The cross-sectional area of ​​the open end of the shell is larger than the cross-sectional area of ​​the first end of the connecting pipe.

4. The apparatus according to claim 3, characterized in that, The second end of the connecting tube is a variable diameter bundle structure.

5. The apparatus according to claim 4, characterized in that, The circumferential gap between the slider and the housing is less than a preset value, and the negative pressure generator is used to provide a negative pressure environment for the space between the open end of the housing and the slider and the inside of the connecting pipe during the process of the slider sliding from the first preset position to the starting position.

6. The apparatus according to claim 1 or 2, characterized in that, The first fixing base is U-shaped and includes a base plate and a first cantilever and a second cantilever spaced apart on the base plate. The first cantilever and the second cantilever are parallel to each other. The distance between the first cantilever and the second cantilever is greater than the central pendulum diameter of the pendulum and less than the outer diameter of the outer ring of the pendulum. The first fixing base is provided with a blind groove that connects the first cantilever, the base plate and the second cantilever. The pendulum is disposed in the blind groove.

7. The apparatus according to claim 6, characterized in that, The first fixing seat also includes a fixing plunger. The first cantilever and the second cantilever are respectively provided with through holes. The outer ring of the swing plate is respectively provided with a boss at a position corresponding to the through hole. Each boss is provided with a connecting hole. The fixing plunger passes through the through hole and the connecting hole to fix the swing plate.

8. The apparatus according to claim 1 or 2, characterized in that, The central axes of the housing and the connecting pipe are parallel; the central axis of the slider is parallel to the central axis of the housing, and the slider slides along its own central axis; the sensitive axis of the pressure sensor is parallel to the central axis of the housing; the central axis of the push rod of the thruster is parallel to the central axis of the housing.

9. The apparatus according to claim 1 or 2, characterized in that, The thruster includes a motor and a push rod connected to the motor. The motor is fixedly connected to the housing, and the push rod is connected to the first end of the slider.

10. A method for evaluating the flexibility characteristics of a pendulum flat bridge, characterized in that, The method employs the apparatus described in any one of claims 1-9 for evaluation, specifically including: S10. Install the pendulum to be measured on the first fixed base. At this time, the central pendulum of the pendulum swings freely. S20. Turn on the negative pressure generator. The center of the pendulum stops swinging freely under the negative pressure suction in the connecting tube and shifts towards the direction of the force transmission rod. S30. Use the push rod of the thruster to push the slider toward the swing plate until the second end of the force transmission rod contacts the center of the swing plate, and take the current position of the slider as the first preset position. S40. Continue to use the push rod of the thruster to push the slider toward the pendulum until the center of the pendulum and the outer ring are on the same plane. Take the current position of the slider as the starting position. S50. Turn off the negative pressure generator and continue to use the push rod of the thruster to push the slider toward the swing plate, so that the center of the swing plate deviates from the plane of the outer ring of the swing plate until the pressure value collected by the pressure sensor reaches the preset value. Take the current position of the slider as the second preset position. S60. Obtain the first displacement of the slider measured by the distance sensor from the starting position to the second preset position; S70. Remove the pendulum from the first fixed seat, rotate it 180° along the pendulum axis, and then reinstall it on the first fixed seat. At this time, the central pendulum of the pendulum swings freely. S80, repeat S20-S50, and obtain the second displacement of the slider measured by the distance sensor from the starting position to the second preset position; S90. The data processing unit obtains the first offset of the center pendulum of the pendulum based on the first displacement of the slider, obtains the second offset of the center pendulum of the pendulum based on the second displacement of the slider, and evaluates the flat bridge flexibility characteristics of the pendulum based on the first offset and the second offset.

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